Title: Protonation of qunioxaline-tetrathiafulvalene (TTF) based derivatives: substituent effect on charge-transfer complexes

Authors: Ravada Kishore; Ramakrishna Bodapati; Jajula Kashanna; Ananda Kumar Jami

Addresses: Department of Chemistry, GIS, GITAM (Deemed to be University), Visakhapatnam, 530045, India ' School of Chemistry, University of Hyderabad, 500046, India ' Department of Chemistry, Rajiv Gandhi University of Knowledge Technologies, Basar, Telangana, 504107, India ' Department of Chemistry, GIS, GITAM (Deemed to be University), Visakhapatnam, 530045, India

Abstract: Herein, we synthesised four new acceptor-donor-acceptor (A-D-A) based donor tetrathiafulvalene (TTF) fused with different units of acceptors. Absorption studies of the chloroform solutions of the compounds 1-4 have been studied, absorption peaks are exhibiting within the range of 250-550 nm. There is source for the protonation studies in the synthesised molecules; hence we performed absorption studies by adding hydrochloric acid aliquots, after protonation interestingly the absorption band shifts from blue region to the red region (520-680 nm) because of the intra-molecular charge transfer. Protonation on the nitrogen atoms of the TTF based units allows for the creation of low band gap between HOMO and LUMO energy level systems and widely useful in NIR optical properties and solar cell applications.

Keywords: π-conjugated molecules; TTF-quinoxaline; substituent role; red region; electrochemical studies; A-D-A based compounds.

DOI: 10.1504/IJNT.2021.116144

International Journal of Nanotechnology, 2021 Vol.18 No.5/6/7/8, pp.388 - 399

Published online: 12 Jul 2021 *

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